 /*******************************************************************************
  * Copyright (c) 2004 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Common Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/cpl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.registry;

 import java.lang.ref.SoftReference ;
 import org.eclipse.core.runtime.IConfigurationElement;

 public class FlushableExtension extends Extension {

     public FlushableExtension() {
         super();
     }

     public IConfigurationElement[] getConfigurationElements() {
         synchronized (this) {
             if (!fullyLoaded) {
                 fullyLoaded = true;
                 RegistryCacheReader reader = getRegistry().getCacheReader();
                 if (reader != null)
                     elements = new SoftReference (reader.loadConfigurationElements(this, subElementsCacheOffset));
             }
             if (elements == null)
                 elements = new IConfigurationElement[0];

             if (((SoftReference ) elements).get() == null) {
                 RegistryCacheReader reader = getRegistry().getCacheReader();
                 if (reader != null)
                     elements = new SoftReference (reader.loadConfigurationElements(this, subElementsCacheOffset));
             }
         }
         return (IConfigurationElement[]) ((SoftReference ) elements).get();
     }

     public void setSubElements(IConfigurationElement[] value) {
         elements = new SoftReference (value);
     }
 }
